Code PO299 - Ford Powerstroke Diesel Forum
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Old 05-31-2011, 04:22 PM
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Code PO299

My CEL came on and Edge Insight says PO299. Any one know what it is?
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Old 05-31-2011, 04:33 PM
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P0299 is turbo underboost. It could be caused by loose boots on the turbo to intercooler tubes. It could be caused by a stuck unison ring.

How often do you drive your truck? How do you drive your truck when you do drive it?

These are relevant questions to assess the turbo condition.

When the code was set did you hear a loud "boom" from the engine bay? Do you hear a loud rushing sound from the bay when accelerating (or attempting)?

These are relevant questions to assess the condition of the boots.

Jonathan
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Old 06-01-2011, 11:29 AM
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I usually only drive it when I need to tow and that is not that much. I have 2 14000#s and one 10000# so when I do use it I do put it to work. I have some pretty good hills around here that it has to go up. I did not here any noise under the hood but I'll check the boots. The truck felt the usual, just the light come on yesterday afternoon while towing my 14000# dump trailer 3/4 full on the highway doing 60 MPH on fairly flat stretch on highway.
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Old 06-01-2011, 11:49 AM
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Infrequent operation is a common cause of turbo vane seizure. The newer flash for the PCM incorporates an "exercise" cycle of the variable geometry to avoid this sort of corrosion seizure but the undesirable "cost" is that the flash also reduces fuel economy and power a bit. It is a very good idea to include a turbo vane cycle in the program if you opt for an SCT custom tune - this is a way to get the desired feature without the associated fuel economy and power reduction from a dealer flash.

This article from Diesel Technician Society has a "how-to" recondition the turbo vanes and the unison ring:

DTS Articles - Turbocharger Reconditioning

Underboost is preferable to overboost as a fault but neither are desirable as a performance condition.

What level of boost are you building? I suspect that you were stomping hard calling for acceleration when the light/code was triggered. By the time the code is thrown it is likely that you will have to recondition the turbo rather than just drive hard with a good cetane boost fuel additive.

Check out the DTS site for the turbo reconditioning article - and many other great articles...they have a new look!

Jonathan
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Old 06-01-2011, 11:49 AM
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At the bottom of this link is a diagnostic on the turbo.
http://www.forddoctorsdts.com/articl...argerGuide.pdf
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Old 11-04-2012, 12:47 PM
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Hi Howell JD,yes i have that problem with E-350,I notice last week that got lost power and check engine light come up with PO299 code....any solution before i take it to shop?
Thanx
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Old 11-04-2012, 12:55 PM
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Lack of power, turbo sticking... You can take it apart and try to clean out your turbo.
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Old 11-04-2012, 12:57 PM
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Found this... It's a bit long, but good vid on how to clean it... Hop it helps!
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Old 01-03-2013, 04:55 AM
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I removed and cleaned the turbo and the EGR valve. Truck runs good sense.
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